CN106282890A - A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof - Google Patents
A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof Download PDFInfo
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- CN106282890A CN106282890A CN201611015131.2A CN201611015131A CN106282890A CN 106282890 A CN106282890 A CN 106282890A CN 201611015131 A CN201611015131 A CN 201611015131A CN 106282890 A CN106282890 A CN 106282890A
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- Prior art keywords
- magnesium alloy
- coating
- nicrbsi
- sic
- corrosion resistant
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
Abstract
The invention discloses a kind of wear resistant corrosion resistant magnesium alloy, it NiCrBSi bond coating including being attached to Mg alloy surface, and be attached to the Al on this NiCrBSi bond coating2O3‑SiC‑Cr2O3‑Si3N4Ceramic coating, wherein NiCrBSi bond coating thickness is 150 200 μm, Al2O3‑SiC‑Cr2O3‑Si3N4Thickness of ceramic coating is 350 700 μm.The magnesium alloy that the preparation method of the present invention prepares, its hardness is high, wear-resisting and corrosion-resistant, excellent performance.
Description
Technical field
The present invention relates to field of material technology, particularly relate to a kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation side thereof
Method.
Background technology
Owing to magnesium alloy has specific strength, specific stiffness height, heat conductivity, machinability are good, and electromagnetic shielding capability waits by force spy
Point so that magnesium alloy has important application at automobile, electronics, electrical equipment, traffic, space flight, aviation and national defense and military industrial circle
It is worth and application prospect.
In recent years, magnesium alloy application improves year by year, but some problems to be resolved make the application cost of magnesium alloy still
The highest.Because the chemical property of magnesium is very active, easily with oxygen, nitrogen gas and water, CO2、SO2Consistency is generated etc. reacting
One layer of non-metallic film that coefficient is relatively low, metallic matrix can not be played the effect of being effectively protected by this tunic.It addition, the standard electric of magnesium
Electrode potential is-2.34eV, is minimum in common metal structural material, when contacting with other metal, galvanic corrosion easily occurs
And accelerate to dissolve.Further, the burning-point of magnesium alloy is low, easily burns in fusion process, it is therefore necessary to take protective measure, industry
Main employing saline flux or gas shield in production, the former easily causes foundry goods and is mingled with, and affects product quality, the HCl etc. of release
Gaseous contamination environment；Or use SF more6Gas, harmless, but due to SF6It is the greenhouse gases making terrestrial climate warm,
Its greenhouse effect is CO223900 times.And the hardness of magnesium conjunction is relatively low, this results in it and wears no resistance.These all become restriction
The key issue of magnesium alloy application.
Summary of the invention
It is an object of the invention to propose a kind of wear resistant corrosion resistant gradient coating magnesium alloy, it is possible to prepare at Mg alloy surface
Bond strength is high, the coating anti-corrosion, wearability is good.Can minimize cost again simultaneously, reduce the pollution to environment.
For reaching this purpose, the present invention by the following technical solutions:
A kind of wear resistant corrosion resistant gradient coating magnesium alloy, it NiCrBSi bond coating including being attached to Mg alloy surface,
And it is attached to the Al on this NiCrBSi bond coating2O3-SiC-Cr2O3-Si3N4Ceramic coating, wherein NiCrBSi bonds at the end
Layer thickness is 150-200 μm, Al2O3-SiC-Cr2O3-Si3N4Thickness of ceramic coating is 350-700 μm.
The present invention also provides for the preparation method of described a kind of wear resistant corrosion resistant gradient coating magnesium alloy, and described method includes:
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is also dried；
(3) at dry magnesium alloy matrix surface flame-spraying NiCrBSi bond coating, spray distance be 100mm～
150mm, spray angle is between 60 °～90 °, and powder feeding gas flow is 0.6～0.8m3/ h, coating layer thickness is 150-200 μm；
(4) Al is sprayed at NiCrBSi bond coating upper plasma2O3-SiC-Cr2O3-Si3N4Ceramic coating, spray distance
For 100mm～150mm, plasma flame flow axis and the angle being sprayed-on specimen surface are no less than 45 °, and spray angle is at 45 °
～between 90 °, powder feeding gas flow is 0.6～0.8m3/h, coating layer thickness is 350-700 μm.
Compared to other bond coating, the present invention uses NiCrBSi as bond coating, and it serves reduction heat treatment
Temperature, improve matrix and be connected the effect of character with working lining, it is achieved good combination.
NiCrBSi of the present invention, between its each composition, ratio does not do specific restriction, as long as each composition reaches effective
Measure.Such as, its content is Cr 14-18wt%, B 3-4.5wt%, Si 3.5-5.5wt%, Ni surplus.
Described Al2O3-SiC-Cr2O3-Si3N4In ceramic coating, Al2O3With the ratio of SiC, it is that each composition is effectively equally
In weight range, typical but non-limiting example such as weight ratio is 7-3:0.5-2:0.5-2:1.
SiC due to stable chemical performance, heat conductivity is high, thermal coefficient of expansion is little, anti-wear performance good, silicon carbide powder is coated with
It is distributed in the inwall of turbine impeller or cylinder block, its wearability can be improved and increase the service life 1～2 times；It is heat-resisting simultaneously, resistance to
Thermal shock, volume is little, lightweight and intensity is high, good energy-conserving effect.The hardness of carborundum is very big, and Mohs' hardness is 9.5 grades, is only second to
The hardest diamond (10 grades), has excellent heat conductivility.Therefore the present invention is by SiC and Cr2O3Combination, it is not only
Anti-wear performance is outstanding, has extremely strong Corrosion Protection simultaneously.
Preferably, magnesium alloy substrate, before magnesium alloy matrix surface sandblasting roughening treatment, is heated to 80-by the present invention
100℃.Before Pen Tu, matrix material is suitably preheated, moisture and the dampness of specimen surface can be eliminated, improve spraying particle
With interface temperature during substrate contact, the painting that the stress that minimizing causes because of the thermal dilation difference of matrix material Yu coating material causes
Layer cracking, thus improve the bond strength of coating and matrix.
The present invention selects NiCrBSi alloy powder as gradient ceramic coating intermediate layer.NiCrBSi alloy powder is to use
The alloy powder that temperature is higher, high-temperature comprehensive property is excellent.The hardness of Cr is high, the Cr of generation2O3Oxide-film can not only stop gas
Further oxidation to coating, can also strengthen the wearability of coating simultaneously..
The coating microhardness of the present invention more than 1020HV, significantly larger than magnesium alloy substrate microhardness (less than
100HV), its anti-wear performance is substantially increased.
Use salt water immersion test, also referred to as immersion corrosion test.After 24h, result is as follows, does not sprays sample corrosion acutely, rotten
Erosion is serious, and surface forms a large amount of black color dots pit, and it is uneven that surface becomes, and has a large amount of corrosion product to produce.And spray sample
Corrosion slowly, is not affected by corrosion substantially.
The magnesium alloy that the preparation method of the present invention prepares, its hardness is high, wear-resisting and corrosion-resistant, excellent performance.
Detailed description of the invention
Technical scheme is further illustrated below by detailed description of the invention.
Embodiment 1
Wear resistant corrosion resistant magnesium alloy is prepared according to following processing step:
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is also dried；
(3) at dry magnesium alloy matrix surface flame-spraying NiCrBSi bond coating, spray distance is 100mm, spray
Being coated with angle is between 60 °, and powder feeding gas flow is 0.6m3/ h, coating layer thickness is 150 μm；
(4) Al is sprayed at NiCrBSi bond coating upper plasma2O3-SiC-Cr2O3-Si3N4Ceramic coating, spray distance
For 100mm, plasma flame flow axis and the angle being sprayed-on specimen surface are no less than 45 °, spray angle at 45 °, powder feeding gas
Flow is 0.6m3/ h, coating layer thickness is 350 μm.
The wear resistant corrosion resistant magnesium alloy that described method obtains, including being attached to the NiCrBSi bond coating of Mg alloy surface,
And it is attached to the Al on this NiCrBSi bond coating2O3-SiC-Cr2O3-Si3N4Ceramic coating.
Embodiment 2
Wear resistant corrosion resistant magnesium alloy is prepared according to following processing step:
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is also dried；
(3) at dry magnesium alloy matrix surface flame-spraying NiCrBSi bond coating, spray distance is 150mm, spray
Being coated with angle is 90 °, and powder feeding gas flow is 0.8m3/ h, coating layer thickness is 200 μm；
(4) Al is sprayed at NiCrBSi bond coating upper plasma2O3-SiC-Cr2O3-Si3N4Ceramic coating, spray distance
For 150mm, plasma flame flow axis and the angle being sprayed-on specimen surface are no less than 45 °, spray angle at 90 °, powder feeding gas
Flow is 0.8m3/ h, coating layer thickness is 700 μm.
The wear resistant corrosion resistant magnesium alloy that described method obtains, including being attached to the NiCrBSi bond coating of Mg alloy surface,
And it is attached to the Al on this NiCrBSi bond coating2O3-SiC-Cr2O3-Si3N4Ceramic coating.
Embodiment 3
Wear resistant corrosion resistant magnesium alloy is prepared according to following processing step:
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is also dried；
(3) at dry magnesium alloy matrix surface flame-spraying NiCrBSi bond coating, spray distance is 130mm, spray
Being coated with angle is 70 °, and powder feeding gas flow is 0.7m3/ h, coating layer thickness is 170 μm；
(4) Al is sprayed at NiCrBSi bond coating upper plasma2O3-SiC-Cr2O3-Si3N4Ceramic coating, spray distance
For 170mm, plasma flame flow axis and the angle being sprayed-on specimen surface are no less than 45 °, spray angle at 60 °, powder feeding gas
Flow is 0.7m3/ h, coating layer thickness is 500 μm.
The wear resistant corrosion resistant magnesium alloy that described method obtains, including being attached to the NiCrBSi bond coating of Mg alloy surface,
And it is attached to the Al on this NiCrBSi bond coating2O3-SiC-Cr2O3-Si3N4Ceramic coating.
Claims (4)
1. a wear resistant corrosion resistant gradient coating magnesium alloy, it NiCrBSi bond coating including being attached to Mg alloy surface, with
And it is attached to the Al on this NiCrBSi bond coating2O3-SiC-Cr2O3-Si3N4Ceramic coating, wherein NiCrBSi bond coating
Thickness is 150-200 μm, Al2O3-SiC-Cr2O3-Si3N4Thickness of ceramic coating is 350-700 μm.
2. wear resistant corrosion resistant gradient coating magnesium alloy as claimed in claim 1, it is characterised in that described NiCrBSi content is
Cr 14-18wt%, B 3-4.5wt%, Si 3.5-5.5wt%, Ni surplus.
3. the preparation method of wear resistant corrosion resistant gradient coating magnesium alloy as claimed in claim 1 or 2, described method includes:
(1) magnesium alloy matrix surface sandblasting is roughened；
(2) by the magnesium alloy substrate compressed air spraying after roughening, washing with acetone is also dried；
(3) at dry magnesium alloy matrix surface flame-spraying NiCrBSi bond coating, spray distance be 100mm～
150mm, spray angle is between 60 °～90 °, and powder feeding gas flow is 0.6～0.8m3/ h, coating layer thickness is 150-200 μm；
(4) Al is sprayed at NiCrBSi bond coating upper plasma2O3-SiC-Cr2O3-Si3N4Ceramic coating, spray distance is
100mm～150mm, plasma flame flow axis and the angle being sprayed-on specimen surface be no less than 45 °, spray angle at 45 °～
Between 90 °, powder feeding gas flow is 0.6～0.8m3/h, and coating layer thickness is 350-700 μm.
4. preparation method as claimed in claim 3, it is characterised in that before magnesium alloy matrix surface sandblasting roughening treatment,
Magnesium alloy substrate is heated to 80-100 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015131.2A CN106282890A (en) | 2016-11-18 | 2016-11-18 | A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611015131.2A CN106282890A (en) | 2016-11-18 | 2016-11-18 | A kind of wear resistant corrosion resistant gradient coating magnesium alloy and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147565A (en) * | 1996-06-06 | 1997-04-16 | 西安交通大学 | Metal-carbide coating preventing superheater of power station boiler from heat corrosion |
| CN104264102A (en) * | 2014-10-15 | 2015-01-07 | 西安石油大学 | Preparation method of nickel base alloy coating on boiler water wall |
| CN105755422A (en) * | 2016-03-30 | 2016-07-13 | 中国人民解放军装甲兵工程学院 | Method and device for preparing gradient metal ceramic composite coating on surface of bias current plate |
-
2016
- 2016-11-18 CN CN201611015131.2A patent/CN106282890A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147565A (en) * | 1996-06-06 | 1997-04-16 | 西安交通大学 | Metal-carbide coating preventing superheater of power station boiler from heat corrosion |
| CN104264102A (en) * | 2014-10-15 | 2015-01-07 | 西安石油大学 | Preparation method of nickel base alloy coating on boiler water wall |
| CN105755422A (en) * | 2016-03-30 | 2016-07-13 | 中国人民解放军装甲兵工程学院 | Method and device for preparing gradient metal ceramic composite coating on surface of bias current plate |
Non-Patent Citations (1)
| Title |
|---|
| 曲文超: "《镁合金、纯铜表面反应热喷涂陶瓷涂层制备工艺及性能研究》", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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Application publication date: 20170104 |